Phylogenomics indicates the “living fossil” Isoetes diversified in the Cenozoic
Fig 4
Rate assignment on crown and stem branches of Isoetes in r8s.
The ratio of effective vs. assigned rates is shown for different smoothing factors in r8s for the stem branch of Isoetes (solid lines) and for the Isoetes crown branches (average; dashed lines), for the concatenated chloroplast (green) and nuclear (blue) datasets. Solid black line represents effective/assigned rate ratio of 1, for reference.